Edexcel International GCSE Biology
Edexcel International GCSE Biology Biological Molecules Exam Questions
Free Edexcel International GCSE Biology exam questions on Biological Molecules, with mark schemes. Covers carbohydrates, proteins, lipids, food tests and enzymes.
Biological Molecules exam questions
These packs of real past exam questions cover the whole of Section 2: Structure and Functions in Living Organisms, including Biological Molecules. Work through every question on this sub-topic, then mark your answers against the mark scheme.
StemUp mark scheme flashcards
Edexcel IGCSE Biology 4BI1 Flashcards (Anki & Quizlet)
Every answer is written in mark scheme wording, so you learn exactly what examiners give marks for. Use them on Anki or Quizlet, then test yourself with the questions on this page.
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About Edexcel International GCSE Biology Biological Molecules
This sub-topic covers the molecules in living things and enzymes.
What you need to know
- Molecules Carbohydrates, proteins and lipids and their building blocks.
- Food tests Iodine, Benedict's, biuret and ethanol emulsion.
- Enzymes Active site, temperature and pH effects.
Common mistakes in Biological Molecules
- Saying enzymes die.
- Forgetting Benedict's needs heating.
Try two Biological Molecules exam-style questions
1. Describe the test for protein. (2 marks)
Show the mark scheme answer
Add biuret reagent (1); a purple colour shows protein (1).
2. Explain why enzymes stop working at high temperature. (2 marks)
Show the mark scheme answer
The active site changes shape (1), so the substrate no longer fits (1).
Biological Molecules FAQs
What does this cover?
Food molecules, food tests and enzymes.
Which practical links here?
Investigating enzyme activity with temperature or pH.
Revise this topic with flashcards: Edexcel IGCSE Biology 4BI1 Flashcards, with mark scheme answers for Anki and Quizlet.
